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Blocking the steps is performed after th- ,.00l shell has been set within level and water rc.._des the tread of the next to last step tread (2nd from floor). When installing CMU piers, start by placing a 1-1/2"capstone block on the base material. On top of the capstone block, stack CMU's (cinder blocks) until they reach a point just under the outermost edge of the top step, tanning ledge or beam of the shell. Since the step area of the pool shell is often lower than the rest of the shell, jack the step package up using a bottle jack and a section of 2" x 6" lumber under the outside radius of the top step (where the top tread meets the top riser). Jack the steps to be level with the rest of the beam of the shell. Shim the gap between the top CMU and the bottom of the tread/riser radius with another capstone block and/or 1/4'concrete backer board. When the bottle jack is released, the pool shell should be level within industry guidelines. Bottlejacks should be removed from the job site once the piers are in place. Do not leave bottle jacks or organic material, such as wood under the pool shell for support. Properly placed piers should be 1/2 under the step of the shell, with the remaining portion of the top block/shim remaining outside the step/riser tread (See Figure 7 for detailed drawing of properly placed piers). Do not place piers completely under the top step or tanning ledge (swimout) as stress will be transferred to the radius between the horizontal and vertical surfaces, resulting in stress fractures. Step 8. PLUMBING A basic swimming pool circulation system is relatively simple in operation. Water in the pool is drawn through the skimmer to the pump, which pushes it through the filter and back to the pool via the returns. See Figure 8 for a basic filtering system diagram. More advanced filtering systems may include sanitizers, jets, blowers, automatic pool cleaners, etc. Latham recommends the use of 2, schedule 40 PVC plumbing on most pools. The plumbing system must be designed to comply with ANSI/APSP-7 STANDARD FOR SUCTION ENTRAPMENT AVOIDANCE IN POOLS AND SPAS (latest revision). Visually inspect and pressure test all plumbing installed at the factory upon the delivery of the pool and during the backfill process. Latham Pool Products suggests placing the equipment slightly above the elevation of the pool. If the equipment is placed below the water level, check valves or shut off valves must be installed to prevent accidental siphoning of the pool. The equipment becomes less efficient the greater the distance away from the pool. Check all connections for leaks and proper circulation before covering them. Local building codes may require pressure testing of the plumbing system before the installation is complete. For alternative recirculation systems refer to the Latham Fiberglass engineering sheets Figure 8 - Basic Filtering System is Step 9. ELECTRICAL If the installer or homeowner is not qualified to do electrical work, an licensed electrician should be hired and a building of- ficial should inspect the work. All electrical work should be done to National Electric Code specifications and any local codes. Latham will not be held responsible for any electrical work.